Vitamin K2 side effects
Across 697 first-hand reports, people mentioned a side effect 16 times (about 2 per 100 reports). The most common: heart palpitations, anxiety, palpitations. User reports show what people notice — they can't tell you whether Vitamin K2 is safe for you.
Reported side effects
heart palpitations5
anxiety3
palpitations2
insomnia2
other symptoms1
brain fog1
felt awful1
high blood1
In their own words
“MK4 is more tolerable, MK7 caused heart palpitations and anxiety for me.”
“A week and a half ago I added vitamin K2 MK4 (Thorne droplets, 1-2 per day)...and now I haven't slept properly in 10 days.”
“I started getting some uncomfortable sides with high dose k2 (Thorne liquid drops). High blood pressure and a constricted feeling around my chest.”
Is Vitamin K2 safe? What the research covers
AResearch: Strong36 meta-analyses · 99 randomized trials on PubMed
None of the top reviews we found focus on safety. All research on Vitamin K2.